<?php

/**
 * Created by PhpStorm.
 * User: moquan
 * Date: 2018/7/4
 * Time: 22:34
 */
namespace page;

use think\Paginator;

class Page extends Paginator
{

    //首页
    protected function home() {
        if ($this->currentPage() > 1) {
            return "<li class='page-item'><a class='page-link' href='".$this->url(1)."' title='首页'>首页</a></li>";
        } else {
            return "<li class='page-item'><span class='page-link not-href'>首页</span></li>";
        }
    }

    //上一页
    protected function prev() {
        if ($this->currentPage() > 1) {
            return "<li class='page-item'><a class='page-link' href='".$this->url($this->currentPage - 1)."' title='上一页'>&laquo;</a></li>";
        } else {
            return "<li class='page-item'><span class='page-link not-href'>&laquo;</span></li>";
        }
    }

    //下一页
    protected function next() {
        if ($this->hasMore) {
            return "<li class='page-item'><a class='page-link' href='".$this->url($this->currentPage + 1)."' title='下一页'>&raquo;</a></li>";
        } else {
            return "<li class='page-item'><span class='page-link not-href'>&raquo;</span></li>";
        }
    }

    //尾页
    protected function last() {
        if ($this->hasMore) {
            return "<li class='page-item'><a class='page-link' href='" . $this->url($this->lastPage) . "' title='尾页'>尾页</a></li>";
        } else {
            return "<li class='page-item'><span class='page-link not-href'>尾页</span></li>";
        }
    }

    //统计信息
    protected function info(){
        return "<p class='pageRemark'>共<b>" . $this->lastPage .
            "</b>页<b>" . $this->total . "</b>条数据</p>";
    }

    /**
     * 页码按钮
     * @return string
     */
    protected function getLinks()
    {

        $block = [
            'first'  => null,
            'slider' => null,
            'last'   => null
        ];

        $side   = 3;
        $window = $side * 2;

        if ($this->lastPage < $window + 6) {
            $block['first'] = $this->getUrlRange(1, $this->lastPage);
        } elseif ($this->currentPage <= $window) {
            $block['first'] = $this->getUrlRange(1, $window + 2);
            $block['last']  = $this->getUrlRange($this->lastPage - 1, $this->lastPage);
        } elseif ($this->currentPage > ($this->lastPage - $window)) {
            $block['first'] = $this->getUrlRange(1, 2);
            $block['last']  = $this->getUrlRange($this->lastPage - ($window + 2), $this->lastPage);
        } else {
            $block['first']  = $this->getUrlRange(1, 2);
            $block['slider'] = $this->getUrlRange($this->currentPage - $side, $this->currentPage + $side);
            $block['last']   = $this->getUrlRange($this->lastPage - 1, $this->lastPage);
        }

        $html = '';

        if (is_array($block['first'])) {
            $html .= $this->getUrlLinks($block['first']);
        }

        if (is_array($block['slider'])) {
            $html .= $this->getDots();
            $html .= $this->getUrlLinks($block['slider']);
        }

        if (is_array($block['last'])) {
            $html .= $this->getDots();
            $html .= $this->getUrlLinks($block['last']);
        }

        return $html;
    }

    /**
     * 渲染分页html
     * @return mixed
     */
    public function render()
    {
        if ($this->hasPages()) {
            if ($this->simple) {
                return sprintf(
                    '<ul class="pagination pagination-sm m-0 float-center">%s %s %s</ul>',
//                    $this->css(),
                    $this->prev(),
                    $this->getLinks(),
                    $this->next()
                );
//                return $this->prev().$this->getLinks().$this->next();
            } else {
                return sprintf(
                    '<ul class="pagination pagination-sm m-0 float-center">%s %s %s %s</ul>',
//                    $this->css(),
//                    $this->home(),
                    $this->prev(),
                    $this->getLinks(),
                    $this->next(),
//                    $this->last(),
                    $this->info()
                );

//                return $this->home().$this->prev().$this->getLinks().$this->next().$this->last().$this->info();
            }
        }
    }

    /**
     * 生成一个可点击的按钮
     *
     * @param  string $url
     * @param  int    $page
     * @return string
     */
    protected function getAvailablePageWrapper($url, $page)
    {
        // <li class="page-item"><a class="page-link" href="#">1</a></li>
        return "<li class='page-item'><a class='page-link' href='".htmlentities($url)."' title='第".$page."页' >".$page."</a></li>";
    }

    /**
     * 生成一个禁用的按钮
     *
     * @param  string $text
     * @return string
     */
    protected function getDisabledTextWrapper($text)
    {
        return "<li class='page-item'><p class='pageEllipsis'>".$text."</p></li>";
    }

    /**
     * 生成一个激活的按钮
     *
     * @param  string $text
     * @return string
     */
    protected function getActivePageWrapper($text)
    {
        return '<li class="page-item"><span class="page-link cur not-href">' . $text . '</span></li>';
    }

    /**
     * 生成省略号按钮
     *
     * @return string
     */
    protected function getDots()
    {
        return $this->getDisabledTextWrapper('...');
    }

    /**
     * 批量生成页码按钮.
     *
     * @param  array $urls
     * @return string
     */
    protected function getUrlLinks(array $urls)
    {
        $html = '';

        foreach ($urls as $page => $url) {
            $html .= $this->getPageLinkWrapper($url, $page);
        }

        return $html;
    }

    /**
     * 生成普通页码按钮
     *
     * @param  string $url
     * @param  int    $page
     * @return string
     */
    protected function getPageLinkWrapper($url, $page)
    {
        if ($page == $this->currentPage()) {
            return $this->getActivePageWrapper($page);
        }

        return $this->getAvailablePageWrapper($url, $page);
    }

    /**
     * 分页样式
     */
    protected function css(){
        return '  <style type="text/css">
            .pagination p{
                margin:0;
                cursor:pointer
            }
            .pagination{
                height:40px;
                padding:20px 0px;
            }
            .pagination a{
                display:block;
                float:left;
                margin-right:10px;
                padding:2px 12px;
                height:24px;
                border:1px #cccccc solid;
                background:#fff;
                text-decoration:none;
                color:#808080;
                font-size:12px;
                line-height:24px;
            }
            .pagination a:hover{
                color:#077ee3;
                background: white;
                border:1px #077ee3 solid;
            }
            .pagination a.cur{
                border:none;
                background:#077ee3;
                color:#fff;
            }
            .pagination p{
                float:left;
                padding:2px 12px;
                font-size:12px;
                height:24px;
                line-height:24px;
                color:#bbb;
                border:1px #ccc solid;
                background:#fcfcfc;
                margin-right:8px;

            }
            .pagination p.pageRemark{
                border-style:none;
                background:none;
                margin-right:0px;
                padding:4px 0px;
                color:#666;
            }
            .pagination p.pageRemark b{
                color:red;
            }
            .pagination p.pageEllipsis{
                border-style:none;
                background:none;
                padding:4px 0px;
                color:#808080;
            }
            .dates li {font-size: 14px;margin:20px 0}
            .dates li span{float:right}
        </style>';
    }
}